NPPB and heart failure: A multivariate linear regression analysis revealed that lower renal Kt/V (β = −1.55, p < 0.01), higher degree of overhydration (β = 0.08, p < 0.01), CTR (β = 0.04, p = 0.02), and the presence of heart failure (β = 0.97, p < 0.01) were independently associated with higher NT-proBNP levels at baseline.